HiCIAO : High Contrast Instrument for next generation Adaptive Optics For Subaru 8.2m telescope

1. HiCIAO: High Contrast Instrument for next generation Adaptive Optics ForSubaru8.2mtelescope BasedonapreviousJapan/MEXTgrant(Tokutei) PI & CoPIs: Motohide Tamura (NAOJ), Klaus Hodapp (UH), Ryuji Suzuki (NAOJ; now TMT) Combined with the curvature-sensing AO with 188 elements (Hayano, Takami et al.) and SCExAO1024 upgrade (Guyon, Martinache et al.) Commissioned in2009 (including Princeton/MPIA teams for angular differential imaging and commissioning) Specifications and Performance 2048x2048 HgCdTe and ASIC readout Wavelengths:1–2.5microns(NIR) Observing modes: DI, PDI (dual beam), SDI (quad beam), & ADI; w/wo occulting masks (>=0.1") Contrasts: 10^-6 at 1", 10^-4 at 0.15" (SDI) Subaru/HiCIAO

2. Camera Wollaston Prism Observation modes of HiCIAO Direct Imaging (DI) mode Polarization Differential Imaging (PDI) mode 20” 10” Spectral Differential Imaging (SDI) mode Angular Differential Imaging (ADI) mode 5” Movie By Thalmann

3. HiCIAO PDR Design

4. HICIAO + Fore-Optics Main access to inside of Cryostat is via VJ Top Cover: Weight ~10 kg HICIAO Fore-Optics; Mounts to AO-Bench Connectors are mounted on a large Sub-Plate to facilitate access to cables through the VJ 3 mm clearance between Fore-Optics and VJ

5. AO-Bench Interface Plate (Subaru-design); to match up with holes on dowel pins to this face Fore-Optics is decoupled from Vacuum Jacket! 3mm Gap between HICIAO VJ and Fore-Optics Assembly

7. Starting point for HICIAO Assembly Sequence V-Truss Assembly (Qty=4) VJ Bottom Plate

8. Note: Lip on the Optics Bench for Light-Seal V-Truss Light Shield Brass Slides Qty=3 Optics Bench Cutouts for Detector Assembly • Brass Slides permit slight adjustments along the optical axis • For Assembly, use shims in places indicated Place Shims here

9. Shim Location Common Path Filter Wheel Assembly (CPFW) Install Light-Tube-1 to CPFW Use .344 inch thick shim to locate CPFW to nominal position; place shim between Filter cover and inside of Optics Bench

10. Pupil Wheel Assembly (PW) Slide PW up flush against Light-Tube-1 Light-Tube-1 Install Light-Tube-2

11. Add Detector Assembly: It must be installed prior to the Differential Path Filter Wheel (DPFW) Detector Assembly Prepare ASIC Flex Ribbon Cable as shown

12. Light-Tube-2 Tongue Light Shield Bottom out against Light-Tube-2 prior to inserting DFPW To keep the Optics Path light tight, a Tongue & Groove design interface is used for the 2 marked parts; the Tongue Light Shield must be inserted before the DPFW

13. Filter Wheel Case Once DPFW is installed, bottom out Tongue Light Shield on Filter Wheel Case and secure with 2 screws Tongue Light Shield DPFW

14. Assembly: Closed Cycle Cooler and 1st Stage Strap to Vacuum Jacket

15. 9x ¼-20 Socket Head Caps with Washer 1st Stage Strap (compliant) 1st Stage Strap is composed of .12mm thick Copper Foils and bent into the configuration shown to cancel out vibrations from the 1050 CTI Cold Head

16. Clamp type design to secure the 1st Stage Strap to the Optics Bench; screws are located on the inside of the Optics Bench (previous slide)

17. VJ Lower Body Hex Socket Head M6 x 25 25 Required Evacuation Valve; Rotates through 360 Deg Connectors and Connector Sub-Plates should be installed AFTER the VJ Lower Body has been bolted in place!

18. Prepare Radiation Shield as shown in this slide; add to Assembly S.H.C.Vented 6-32 x 5/8 32 Required

19. Radiation Shield without Shield Top Plate Note: This assembly state should be used to wire up the instrument

20. CTI Cold Finger will slide through the inside of the Getter Shield Getter Shield attached to Radiation Shield Tube 1st Stage Strap

21. Vibration Isolation Mount Closed Cycle Cooler Assembly 1st Strap Access Cover 2nd Stage Getter Assembly CTI 1050 Cold Head Safety Finger Qty3 Cold Wire to Detector CCC Mount Flange Prior to Vacuum, the CCC Cold Head is loose. After Vacuum is applied Cold Head is compressing the 2 Isolation Rings (Rubber); 3 Safety Fingers limit the motion of the Cold Head with no Vacuum

22. 1050 CTI Cooler assembled to Vacuum Jacket Use these Screws to limit movement of CCC Cold Head when not under Vacuum; 3 Places Access Hole in CCC Mount Flange; used to bolt 1st Stage Strap to CCC Cold Finger

23. Changing Filters;Lenses etc

24. Access Covers to Filter/Lenses Hall Sensor Mount This and next slide show state of disassembly necessary to perform maintenance and change filters/sensors/lenses etc.

25. View into open Cryostat: Entrance Window at Right

26. HICIAO Installation on NASMYTH • After PDR, Fore-Optics and Vacuum Jacket became 2 independently mounted assemblies • Wollaston Prism is close to Vacuum Jacket for optical performance reasons • Must protect Wollaston Prism from possible collision with Vacuum Jacket upon installation • Next slides discuss new design for mounting procedure of Fore-Optics and Vacuum Jacket on Nasmyth Floor

27. Common Path Filter Wheel Front Back Dowels lineup unit perpendicular to Optics Bench Mounting surface Cover shown partially transparent For more Details: See PDR Document 3.2.2.3.6

28. Filter Wheel Case Holder Mechanism Registration: Brass Slides permits parallel, limited translation along the optical axis Slotted Holes; allow limited adjustment along the optical axis

29. Filter Wheel Cover removed Magnets in Wheel Detent Spring Detent Cam & Driver Assembly Hall Sensor Geneva Wheel 12 positions Filter Cell

30. Filter Access Cover; held in place with leaf spring PHYTRON CRYO-Motor Hall Sensor Gear Train Ratio 8:1 Bearing Mount

31. Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) M. Tamura (NAOJ), and SEEDS/HiCIAO/AO team

32. Linear Polarization Map of the T Tauri Star UX Tau B Taken with HiCIAO as part of SEEDS